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प्रश्न
State whether the following statement is true or false. Correct the false statement.
Phenolphthalein is a natural indicator.
विकल्प
True
False
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उत्तर
This statement is False.
Explanation:
Phenolphthalein is a synthetic indicator.
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संबंधित प्रश्न
Do basic solutions also have H+ (aq) ions? If yes, then why are these basic?
- Both acids and bases change colour of all indicators.
- If an indicator gives a colour change with an acid, it does not give a change with a base.
- If an indicator changes colour with a base, it does not change colour with an acid.
- Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
The indicators which turn red in acid solution are ______.
The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powdered chalk to adjust its pH and why?
Water is a neutral substance. What colour will you get when you add a few drops of universal indicator to a test-tube containing water?
Someone put some universal indicator paper onto wet soap. The pH is 8. What does this tell you about the soap?
A group of students measured the pH of some substances they found in their homes. Their results are given in the following table:
| Substance | pH | Substance | pH |
| Apples | 3.0 | Salt | 7.0 |
| Baking soda | 8.5 | Sugar | 7.0 |
| Black coffee | 5.0 | Toothpaste | 9.0 |
| Household ammonia | 12.0 | Vinegar | 3.0 |
| Lemon juice | 2.5 | Washing soda | 11.5 |
| Milk | 6.5 |
(a) What would the students have used to measure the pH?
(b) Which solution is the most acidic?
(c) Which solution is the most alkaline?
(d) Which solutions are neutral?
(e) Which solution can be used to treat wasp stings?
(f) Which solutions can be used to treat bee stings?
In basic solution turmeric indicator paper changes from yellow to _______.
Name the acid present in vinegar.
Write a note on:
Methyl orange
